Tacx resistance levels

Currently using a basic Tacx Turbo alongside a HRM to get in shape for Spring. Work and family commitments are keeping me off the road whilst the mornings and nights are still closing early.
Does anyone know of a rough guesstimate to equate the resistance levels on the Tacx (1 being least resistant to 10) in terms of how that would reflect to actual % gradients out on the road???
Does anyone know of a rough guesstimate to equate the resistance levels on the Tacx (1 being least resistant to 10) in terms of how that would reflect to actual % gradients out on the road???
0
Posts
Then use online calculator to see wattage required for road speed etc.
http://bikecalculator.com/wattsUS.html